Thanks for your query.
You seem to be developing rash of seborrheic dermatitis
This is seen on the hairy parts of the body mostly and involves face, scalp
, chest and upper back.
Treatment of this condition involves the use of topical steroid
and antifungal combination creams.
Oral antihistamines can be taken for the associated discomfort and itching.
Avoid using dettol
or any harsh face wash or creams over the affected areas.
Hope it helps
Dr Geetika Paul