If by back of the head you mean just behind the ear or a little lower, it could be mastitis from an undiagnosed ear infection. If that's where it is, you need to see your doctor quickly.
Ulcerative colitis diagnosed in 2001; symptoms as early as 1992. Currently in 7th year of remission with Remicade.
Inflammatory osteoarthritis; osteonecrosis from steroids
Grave's disease successfully treated with radioactive iodine and now on Levothyroxine.
Type II diabetes induced by steroids.
Eczema, darn it!
Meds: Remicade, Colazal, Levothyroxine, Mobic, Metformin
Moderator, thyroid forum