Your symptoms are not conclusive of HIV. However, they do signify a chronic underlying inflammation. The lumps behind the ears may be lymph
node enlargement. Your weight is inconsistent. The most common possibility I can think of is Tuberculosis
. The rashes on fingers and soles of feet, cold
sores could all be due to other chronic condition like Leprosy
(I suspect this very less).
Get a Mantoux test
done to check your immune status. Get a chest x-ray done as well.
If you think of HIV as a possibility, get tested for it as well. It is always better to be precautious and take care of our health.
There is something wrong in your systems that need to be detected and managed accordingly.
Get well soon.