Possible cause of numbness in back of both legs after a shower? not tingling or weakness but numbness after a shower. shower water is not hot but warm to lukewarm. happens only after a shower or time in warm pool, no other time. bed sitting stops it?

Please get checked out by your MD or a neurologist.

There are people who experience itching or rash after a shower or bath. It is felt that loss of skin oils plays a role and rubbing in a moisturizer while the skin is still moist after the shower helps. Your symptom may be a variant of these reactions you experience after the shower. Try rubbing in the moisturizer while your skin is moist after the shower.