my dd who's 9 had a horrible boil on her leg six months ago and I left it ti heal itslef and it's left a horrible scar on her leg. Two\months ago she complained of another lump above her armpit but it disappeared in a few days. A week or so later she got another one under her armpit and I tooke her to the doctors. he said it was blocked sweat glands, nothing to worry about. he checked her for diabetes - not sure why but she was fine. She's now got a sore lump just above her knee on the back of her leg but it's not goign away - anyone got any idea what it may be? should I go back to dr?