my daughter is 2 yr and 9 months old . few days back she had a small pimple with little puss on her back . Behind the skin of the spine. My mother in law put vicks for it to dry off . it just dried. again a new pimple like a boil came from the same place and it was above to open but while travelling some how it got opened but nothing much went out from the boil and it got dried. but there is a small lump just beside the boil and it is paining . what is this lump how to get rid of this . please help .