I went on holiday a few weeks back and I think I got bitten on my breast with these small black bugs, it started as a little red spot then it gradually got bigger and I've recently decided to pop it and white stuff and clear stuff came out it, now it's gone a purple colour and has a bruise around it, is it anything I need to worry about? It is too sore to try to pop it again I'm just a little worried about it can someone please answer this question? To put my mind at ease! :)