Hi, wasn't sure what section to put this in so using this one. Today I noticed a purple lump on my forearm about a centimetre in diameter and raised about two millimetres. Within 10 mins of noticing it the lump stayed at one centimetre in diameter but went back almost flush with the skin? It doesn't hurt when I touch it and it looks like it is directly above a vein. Can anyone help with this one please?