<human>: I have had an itchy rash on my chest ,thighs and arms for the last three weeks until I realised that the water I was using from my roof tank to take showers maybe contaminated. I only applied ice cubes on the affected areas. Could this water be the cause and if so is there any medical product that I can use?
<bot>: Hi there. It is very difficult to ascertain sans visualization or analysis of the water to state that your tank water can have caused this problem. The itchy rash may be unrelated & will require you to visit a dermatologist or /& upload photographs here to help you better. Use a topical steroid lotion such as mometasone furnace twice/daily for the affected areas & see if it responds in 48 hrs together with systemic fexofenadine tablets 180 mg taken once/day. Cheers & Good luck!