Herpes as you know is a STD that often recurs at times of stress. These are usually very painful. Dermatitis, allergic is like poison ivy. Contact dermatitis is caused by an exposure to a substance which cause the rash like a soap, detergent or other foreign chemical. Chronic contact dermatitis is longer lasting and causes chronic skin discoloration.
Drug eruptions can occur up to four weeks after exposure to a drug usually an antibiotic.
This lesion is self limiting and goes away when the exposure to the drug is removed. Pearly penile papules are chronic and usually are first notes after puberty and are benign. What ever the cause of the lesion you need to see a doctor especially when the lesions are present for an accurate diagnosis. A dermatologist maybe your best bet to get a firm diagnosis. We can also arrange local accommodations through this number if this is your need.