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I have seen your photos (attachments removed to protect patient identity).
It is a small reddish papule. Since how long have you had this? Is it painful?
This could be either of these.
Many other differential diagnoses are there. Being an experienced dermatologist, I want to assure you that no doctor can diagnose it without doing a biopsy or FNAC (fine-needle aspiration cytology). As I told there could be many differential diagnoses of it, so duration also is an important factor.
If duration is about three to five days, then more chance of any insect bite (which is very common). But, ultimate tool to identify it is by biopsy or FNAC only. So, I suggest you to go undergo this test procedure to clear it.