I have a rash that has tiny blackheads that also are very itchy and stinging. can you give me an idea how i can treat this rash. it is only on my ches?

Unknown Rash: It may be helpful to give a more detailed description or a picture. This is a vague. You want the proper treatment so if possible give more details. Thank you.

Blackheads in 50 yo: Soap and water work for black heads. On only one side of chest in a narrow band and really stinging, consider shingles which is treated with prescribed drug. However, if the "blackheads" are not clearing up, ... at your age you may have a serious skin disease that needs dermatology evaluation and even biopsy (eg for melanoma).