It could be fungal. Has it spread, or did it just show up all at once? If antihisthamines don't help I would try some dandruff shampoo or Lotrimin and see if that helps.
If it does get worse, see a doctor.
20yr old female diagnosed with UC (mod-sev pancolitis)
in 2005 at age 15
125mg Azathioprine 1xday / Rowasa 1xday
500mg Vitamin C 1xday / 1000IU Vitamin D-3 1xday / 1000mg Turmeric 2xday /
400IU Vitamin E 1xday / 450mg Boswellia 1xday / 550mg Bee Pollen 1xday
Arthritis in both knees
Also: asthma, acid reflux, and Raynaud's Syndrome