What is the reason for small pimples on shoulders and back?

Q: I am a 30-year-old male from UAE. I have small pimples on the side shoulders, side of my body and back, which keep appearing and disappearing. What is the cause and how can I over-come this issue?

A:At your age, it is likely that it may be truncal acne, miliaria (prickly heat), or drug induced acne-form eruption (due to drugs for asthma). Unless, you consult a dermatologist, your diagnosis cannot be made. Treatment depends on the diagnosis i.e., the problem you have.