One possibility for such kind of lesions
could be boil or carbuncle. A boil, also referred to as a skin
abscess, is a localized infection deep in the skin. A boil generally starts as a reddened, tender area. Over time, the area becomes firm and hard. Eventually, the center of the abscess softens and becomes filled with pus.
Apply warm compresses and topical antibiotic cream on the boils like Mupirocin or Bactroban.If the symptoms persist then oral antibiotics may be needed.