It Started With A Small Red Bump Above Left Eyebrow,

It started with a small red bump above left eyebrow, then rash bumpy sores in the hairline, then soft and real sore bumps on my head(like as if I hit my head and now have a bump) which that never happened, swollen and very sore behind the ear with a bump, now I'm feeling soreness and very tender in front of that ear. Everything is only on the left side of head and went to a doctor who can not explain and gave me cortisone cream to put on it. Almost everyday I'm noticing more red spots or sore areas.