Never seen before black insect bite with hole in center

[eightybaby]

Noticed a raised, black in color, " insect looking bite" on top of my foot yesterday evening. It has a hole in the center, it doesn't itch & only hurts a little when I push on it. Just a little concerned because I haven't ever seen anything even simlilar. Any ideas?

[maatson]

Possibly spider bite associated thrombocytopenia.

[eightybaby]

On 9/5/13 I noticed a raised, black in color, " insect looking bite" on top of my foot yesterday evening. It has a hole in the center, it doesn't itch & only hurts a little when I push on it. Just a little concerned because I haven't ever seen anything even simlilar. By the evening of 9/6 I had a lot of pain in my foot (bones hurting). Arrived to ER 9/7/13 at 8 a.m then noticed red webbed looking rash from toes to ankles & my toes were bruising on both feet. They ran my blood work & I was admitted to the hospital because my blood platelet count was very low (32,000, normal is 150,000 or greater.) I was visited by several doctors that are still uncertain of my diagnosis. The doctors treated me like I had a tick borne illness until more lab tests come back & they say they still may not have a diagnosis!?! I haven't had a tick bite since I was a child. They put me on antibiotics which increased my platelets to 70,000 so they discharged me 9/9. I'm still taking antibiotics, only having pain where the one bigger spot is and around it. I also have 3 of these blackish "bite looking" spots in a triangular shape on my foot...Does anyone have any ideas?

[Bhupinder Kaur, MD]

Hello,
It can be a boil, cyst or hematoma. Apply warm compresses on the lump and keep the area clean. Topical antiseptic treatment and topical antibiotics such as mupirocin or neomycin containing ointment is very useful.If still the lump persists then specific treatment like antibiotics,vit A supplements, and sometimes excision and drainage are found useful.I feel that you should consult a dermatologist and discuss these options with him.

It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.