Welcome and thanks for posting your query on HCM.
As per your query your little finger got red and swollen with 2 red bumps on arm.
It appears from your query you got insect bite hypersensitivity
This is common to find redness
and itching with pain over the areas bitten by insects. It appears suddenly as you noticed it after sleep.
You need to be worried about the same. It will be totally alright in next 48 hours. You do not try to do anything over it like any hot compression or any cream application rather ca do cold
compression over the affected part. If the redness increases or pain arises then you can consult a doctor
Wish you good health.
Dr Sanjay Kumar Kanodia
(MD- Dermatology & STD