A few days ago dd had 1 large and 1 small whitehead on her knee, totally look like proper teenage whitehead spots. The small one disappeared but the large one's whitehead burst and she has since had a large (0.5cm) red lump under the skin. Another little whitehead has come and gone and this evening there's another big one - a red area about the size of a 2p coin and a whitehead in the middle. Definitely a pus type whitehead and not a clear fluid blister - only ever on the one knee. I've been putting antiseptic cream on it but am at a bit of a loss as to what I should do, if anything, and what might be causing them.
Anyone got any ideas? She's 4yrs old.