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Initially i thought of Herpes Zoster
, but it will be restricted to only one side of your body and it would not happen frequently. It is unlikely to be herpes simplex
Are you in a habit of sleeping outdoors, or with the lights on and windows open? A blister
beetle can cause such an eruption. Also a contact allergy
to a perfume you use on your body ?
These are some of my best guesses.
A dermatology consultation will definitely help as seeing the rash is definitely more helpful for accurate diagnosis
Hope this helped