You must elaborate few things:
2.Any health conditions like diabetes
3.Since when is the lesion there. Is this a redcurrant lesion
4.Is there pain on touch.
5.What color is it
6.Is there a local increase in skin warmth.
7. Has the skin around it become reddish
From the original information you gave it looks like a furuncle
, also called a boil and is usually associated with infection around a hair root.
ointment works best since the bacteria that cause this type of infection of staphylococci and streptococci and they respond best to Fucidin.