Itchy Skin After Bath? Tap Water Could Be to Blame

Does your skin itch right after a bath? You’re not alone. As a medical doctor, I have seen many people experience this uncomfortable reaction, myself included. Oftentimes, the culprit is right in your bathroom – the tap water. Over the years, I have continually sought effective ways to treat and prevent this condition.

The itchiness usually occurs immediately after taking a bath with tap water, occurs mostly in the afternoon or evening, less in the mornings, and occurs on random areas of the arms, trunk, shoulders, and some other parts of the body, but subsides a few minutes after the bath. You may notice tiny goosebumps on your skin which does not leave any signs after.^[1]Otamere H.O., Akpamu U., Odiase D.E., Osarenotor E.N. 2022. Post-bath Itching in Ekpoma and Environs: A Disturbing Prevalence Rate. Afr. J. Biomed. Res. Vol. 25 And then, over time, eczematous rashes may form over your back, neck, or shoulder.

If that description fits your experience, your tap water could be to blame. A combination of sensitive skin and the effect of certain chemical constituents in your tap water can make you develop skin itch after a bath.

In this article, we will explore why it happens, how common it is, and what you can do to prevent and treat it effectively.

Why Does Some Tap Water Cause Skin Itching

One of the first questions you would like to ask is, ‘Why does bathing with tap water make me itch?’ To answer this, I’d like to say that not all tap water causes this kind of skin itching. I’m sure you’d agree with me, don’t you?

If you have noticed that this kind of skin irritation occurs only with some tap water or at a different destination, it is likely that the tap water you are bathing with is the cause of the skin reactions you are experiencing. Some experts have called this kind of skin reaction “Aquagenic pruritus”.

It also means that you have sensitive skin, but why does it not occur when you are bathing in the swimming pool, or the river, or even when using water from a well or spring? It is typically because of what some tap water contains.

Borehole water differs in its constituents depending on the location and depth of the borehole. Oftentimes, people site boreholes at shallow depths where certain hard minerals like calcium and magnesium salts, as well as iron, easily leach into the water. These chemicals cause water hardness and are the usual culprits for your skin itching after bathing with tap water.

How Hard Tap Water Causes Itching After Bathing

There are several specific reasons why you may itch after a bath, but if the itching occurs within minutes after bathing, it is likely due to some allergic or hypersensitivity reactions to the water constituents. In the case of hard water, it is due to a sensitivity to the constituents of hard water (calcium and magnesium carbonates).

After a bath, these tiny salts may deposit on the skin as it dries. And if you have sensitive skin, these might irritate the skin, causing characteristic skin itching after taking your bath. This irritation is particularly common in people with dry and sensitive skin.

Hypersensitivity to the water constituents makes your body release histamine, the same chemical mediator responsible for allergies. Histamine is what causes this skin reaction, which is why antihistamine medications may be helpful.^[2]Aquagenic Pruritus: A Review of the Pathophysiology-Beyond Histamine – Research Gate

How Common is This Itchy Skin After a Bath?

Since I got to know about this condition, I have interacted with nothing less than twenty people who experience it. Almost all of them live permanently or temporarily in Nigeria. Several studies have also indicated that this type of skin reaction, ‘Aquagenic pruritus’, is indeed very common in Nigeria. One study in Edo State, Nigeria, gave a prevalence as high as 60%.^[3]Otamere H.O., Akpamu U., Odiase D.E., Osarenotor E.N. 2022. Post-bath Itching in Ekpoma and Environs: A Disturbing Prevalence Rate. Afr. J. Biomed. Res. Vol. 25 Another study done in Lagos State showed a 21% prevalence rate^[4]Salami TA, Samuel SO, Eze KC, Irekpita E, Oziegbe E, Momoh MO. Prevalence and characteristics of aquagenic pruritus in a young African population. BMC Dermatol. 2009 Apr 17;9:4. doi: … Continue reading, while Dermnet reported up to 25% among adult Nigerians.^[5]Dr Adam Dedat. Aquagenic Pruritus – Dermnet

These show that aquagenic pruritus or itching after a bath is common than we think.

From the Lagos state study above, 23% of respondents had similar reactions to rain water, and 19% to cold water from any source. While the exact chemical constituents of the above water sources could not be identified in the study, it could also be due to the presence of calcium and magnesium salts of hard water.

How Severe is Post-Bath Itching

The post-bath itching from tap water or other hard water used for bathing can range from mild to severe. Several factors determine how severe the itching will be.

These are related to the amounts of these salts in the water, as well as the temperature of the water. Coldness increases hardness by decreasing the solubility of the dissolved minerals, causing them to precipitate out and increase hardness. Cold also increases the sensitivity of the skin in those who have allergies or sensitive skin.

About 8.3% of the respondents in the Lagos state study reported feeling like avoiding bathing due to the itching. One peculiar thing about this post-bath itching is that it seems to get worse the more you think about it. Unsightly objects, dirt, or dirty colors often trigger you to experience more itching until it eventually subsides.

Prevention of Skin Itching After a Bath

Having seen all of these about itchy skin after a bath, let’s delve into the treatment and prevention of this condition. I will begin with the home remedies you could try first, and then end with why you may need to see a doctor if the itching is very severe and nothing works for it.

The easiest fix would be to change your bathing water, but if that is not readily possible, here are some ways to prevent skin itching after a bath.

1. Keep your skin moisturized

You are more likely to have itchy skin after a bath if you have dry, sensitive skin. Thus, by preventing skin dryness, you can reduce its sensitivity to water chemicals like those in hard water. Always keep your skin moisturized with a mild moisturizing lotion/cream. Wear protective clothing always.

To test if your skin is dry, firmly run one of your fingers over any part of your skin. If your finger makes a whitish line on your skin, it confirms that your skin is not adequately moisturized.

2. Take short but frequent baths with milder soaps

Bathing regularly helps wash off dirt and prevent it from staying longer on your skin. Your moisturizing cream also needs to be washed off after some time. This is because the chemical may change or interact with substances in your environment, which may cause skin itching.

While bathing frequently may help get rid of contaminants that may irritate sensitive skin, bathing too long in a single bath, scrubbing too hard, or using harsh soaps can strip off the protective oils on your skin and make it drier. Dryness increases skin sensitivity, predisposing to more itching after a bath.

3. Boil your bathing water

Boiling bathing water is a very effective way to prevent skin itching after a bath. Almost everyone with itchy skin I know who tried this intervention always comes back with good testimonies.

Boiling your bathing water helps dissolve the chemicals implicated and can also reduce the skin sensitivity by giving an additional soothing effect to your skin. The goal is not to kill micro-organisms because, in the case of tap water, they are rarely the problem. So, it is important to bathe with the water when it is still warm because when it gets cold, the chemicals precipitate out again.

If you anticipate skin itching after your next bath, boil water and mix it with your bathing water until it feels hot on your skin but warm enough not to burn your skin.

4. Add baking soda or vinegar

While boiling bathing water is effective, it is often not sustainable for some people. Having to boil water every day, and at least two times a day, can increase your gas or electricity costs.

Baking soda (Sodium Bicarbonate) or vinegar is a more feasible and quicker fix when you want to neutralize the irritant chemicals in your bathing water. Baking soda helps soften the water by binding with the calcium and magnesium. This neutralizes these chemicals, preventing skin itching caused by their presence.

Vinegar also neutralizes some minerals, but it is less effective for hard water. You can try it until you get baking soda.

5. Use a shower filter

Showerhead filters often contain KDF (Kinetic Degradation Fluxion), carbon, or vitamin C, which helps reduce chlorine, and in some cases, also target calcium and magnesium. KDF water filters utilize a copper-zinc formulation to remove contaminants through a redox (oxidation-reduction) process.

You can contact a water treatment company to help you install a shower filter into your bathroom taps and shower to prevent skin itching after taking a bath.

6. Install Whole-House Water Softener System

While this is more expensive, it is the best option for homeowners with several individuals in the household. In addition to skin itching after taking a shower, hard water can impact domestic activities in several other ways. Hence, a whole-house water softener system would be highly beneficial.

Water softener devices can come as small faucet heads, or filter chambers attached to your water tank outlet before distributing water to your home, or larger softener systems big enough to occupy a considerable floor space. Discuss with a water treatment company about your water softening needs and budget.

Other preventive tips

• Gently pat your skin dry with your towel instead of aggressively rubbing.
• Use mild or non-soap cleansers.
• Moisturize your skin immediately using products containing glycerin, shea butter, or ceramides.
• Wash your towel regularly to remove calcium and magnesium salt deposits.
• Wash your water tank regularly, at least once or twice a year.
• Sink a new borehole if your tap pumps out obvious impurities like iron or whitish deposits.
• Also, wash your sponge frequently, especially if you don’t wash off soap from it after bathing.

Treatment of Skin Itching After a Bath

Many of the tips above are centered on how you can prevent skin itching after bathing with tap water. But how do you treat it when you are experiencing it?

Skin itching after bathing usually resolves spontaneously within 5-10 minutes, but if it is severe enough to warrant hospital admission, your doctor knows which injectable medications to give you for quick relief.

Oral antihistamines may help control skin itching, but their actions take a long time to begin, such that the time they take to start acting is more than enough for the skin itching to resolve on its own. Thus, oral medications might be beneficial if taken within 30 minutes before a bath – Still preventive.

However, the following can offer you quick relief when experiencing post-bath itching.

• Bicarbonate emollients.
• Ultraviolet B phototherapy and oral antihistamines.
• Baking Soda bath.
• Capsaicin cream.
• Naltrexone.
• Psorialem Ultraviolet A (PUVA) and Astemizole.
• Atenolol.
• UV A/narrow band/UV B therapy.
• Tight-fitting clothing.
• PUVA and Capsaicin.
• Alcohol rub.
• Propanolol.
• Psorialein photochemotherapy.

The above treatments reduce skin itching by targeting inflammation, balancing skin pH, desensitizing nerve endings, blocking histamine or opioid pathways, and calming immune or nervous system responses.

Other Causes of Skin Itching After a Bath

• Aquagenic urticaria: A Rare, severe allergy to water from any source, and of any temperature or pH.^[6]Yung-Chiang Chen, Wen-Hsin Hsu, Chun-Ming Sun, Chao-Hong Liu. A case of aquagenic urticaria with a brief review of the literature. Dermatologica Sinica. Volume 36, Issue 3, 2018. Pages 146-148. ISSN … Continue reading
• Acidic water pH
• Chlorine rash: Due to excess chlorine in the water. Lesions may form, which may later blister and rupture.
• Cold urticaria: A form of skin allergy resulting from excessive exposure to cold or cold water.
• Chronic liver failure/renal failure: Chronic organ failure can lead to the accumulation of pruritogenic metabolites on the skin, including ammonia, urea, and creatinine.
• Drug reactions: Some drugs may cause skin itching as a side effect. Examples include sulphonamides and chloroquine. This may be associated with or aggravated by contact with water.
• Skin parasites like scabies, bugs, and mites.

Final words

Itchy skin after bathing with tap water results from skin hypersensitivity to the hard water minerals. If you only experience an itchy skin after bathing with tap water but not with other water sources, these water chemicals are most likely implicated.

Hard water chemicals are not harmful to the body when ingested orally, but they can irritate the skin of those with sensitive skin. Have you experienced itchy skin after a bath? Share your experience and/or what helped you resolve it in the comments below