Antibiotics. Probably some superficial infection present. If area smaller than a nickel wouold use over the counter neosporin twice a day for a week should do it. If not better or lesion greater than a nickel in size will need oral antibiotics prescribed by physician.
Impetigo. Impetigo (pyoderma) is the most common bacterial infection of the skin. It is contagious and can happen at any age, but is most common in young children. Impetigo appears in the form of reddish sores that blister to produce a yellow-brown fluid. This fluid dries to form a thick, honey-colored crust. You need to see your doctor for antibiotics.