hi..thanks for the query. There are two most common possibilities: 1) Boils:A boil is a skin infection that starts in a hair follicle or oil gland.Most boils are caused by a bacteria.people more susceptible to skin infections:Diabetes,Problems with the immune system,Poor nutrition,Poor hygiene.You may apply topical antibiotic creams like Mupirocin twice daily on the lesions. 2) Keratosis Pilaris: this is a common skin condition in which keratin forms hard plugs within hair follicles.it is harmless.It is more common in people who have dry skin.Treatment may include:Moisturizing lotions to soothe the skin and help it look better.Skin creams that contain urea/ salicylic acid/tretinoin. You can consult a dermatologist for finding out the exact diagnosis. Hop this helps .Take care!