6months ago I found A lump on my head,about 2cm. Went to the doctor who said come back if it doesn't go or if it gets bigger. Went back lump now about 4cm, went back, told the same. Lump got to about 6cm so went back. Different doctor looked concerned, said would refer me for a scan and a letter would come in the post. Three weeks later no letter. Should I Just go to A and E or maybe a walk in?