Welcome to healthcare magic forum.
Thank you for your query.
I understand your concern regarding your skin problem.
it may be due to infection ,allergic condition or eczematous one.
It may also associate with your medical illness also.
It is difficult to comment about diagnosis from your detail.
for itching you can take anti histaminic medicine.
It is better to consult dermatologist
for proper treatment.
you can use local antibiotic
cream over it.
You may required to take other antibiotic and anti allergic medicine also.
Keep the area dry and clean.
Wear loose and cotton cloths.
I hope I answered your question.
Let me know if you have any further query.