Welcome to Just Answer and thanks for your question. Some people are sensitive either to the force of the water hitting their body, or to the temperature. You can try using lukewarm (body temperature) water and the lowest possible pressure setting and see if that helps. Some people find baths instead of showers eliminate the problem.
Obviously your skin is reacting to either temperature or pressure. Some people just have more sensitive skin and have to learn to adapt to baths or live with being blotchy for a while after a shower.
Hello, I tend to agree with the other expert (histimine reaction). There is a somewhat common condition called Adrenergic Urticaria that some people get when they take showers. Basically, if you are taking a shower that feels warm to your skin, then the temperature is above 98.6F, so you are getting a vasoconstriction. The histimine response to all of this causes the discoloration of the skin (redness/blotchiness) and even wheals (itchy bumps).
This also is common after exercise, stress, or anything that makes you hot (warm).
It has been a pleasure helping you today. If I can help you further, please reply. If not, thank you for using JustAnswer.com and hope you will use the service again soon.
Underlying allergies seem to be a contributor since Mast cells seem to be involved. Also patients who have had or have Atopic Dermatitis also seem to be at a higher suspectibility to Adrenergic Urticaria. An Allergy Specialist (Physician) would be a good resource for you in getting to the bottom of your particular cause. Allergy tests are sometimes suggested in patients with Adrenergic Urticaria because they seem to have a higher incidence of anaphylactic-type reactions to other things (that is what the allergy test will help determine). You may have just started developing underlying allergies. If you are diagnosed with Adrenergic Urticaria, then you are already getting a rise in serum histimine when exposed to heat, so there is already something going on.
It has been a pleasure helping you today. If I can help you further, please reply. If not, thank you for using JustAnswer.com and hope you will use the service again soon