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Doctor insights on: Spider Bites That Look Like Bruises

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I have a small bump on the inner side of my knee cap. It hurts when i walk and kneel down. No idea what it is from. What is it thought it was a spider bite a few months back. Then it looked like a bruise and now is a bump a little smaller than a dime.

Yes, : Yes, please have it looked at. It sounds like it is a post-infectious swollen area. As it is persistent and you have pain, you need to be evaluated. If you have increased redness, pain, fever, or discharge, then you will need to be seen in the emergency room. ...Read more

Bruise (Definition)

Bruises, or ecchymoses, are a discoloration and tenderness of the skin or mucous membranes due to the leakage of blood from an injured blood vessel into the tissues. Pupura refers to bruising as the result of a disease condition. A very small bruise is called a petechia. These often appear as many tiny red dots clustered together, and could ...Read more


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I read your answer about a small white bump on a real spider bite being an entry site for the venom.Do you know what type of spider this could be?I have the bite and had fevery and nausea last night and black bruise looking/now purple underneath. I've al

I read your answer about a small white bump on a real spider bite being an entry site for the venom.Do you know what type of spider this could be?I have the bite and had fevery and nausea last night and black  bruise looking/now purple underneath. I've al

Where do you live?: Brown recluse spiders are found in central and southwest states. Their bites are quite rare, usually painful, forming ulcers. Unless you saw the spider, felt the bite, and took the spider to an expert, assume it is something else. Black widow bites are even more rare. See a DR to find out what you have instead of spider bite. ...Read more

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4Months ago had sudden large blister-went to doc-said probably a spider bite-he cut open blister-but area still red/dark like a bruise &hard in center?

4Months ago had sudden large blister-went to doc-said probably a spider bite-he cut open blister-but area still red/dark like a bruise &hard in center?

4 months or 9???: See a dermatologist for a better diagnosis and treatment determined by this. Did you see and feel a spider attack you? Did you take the spider for identification? If not, assume it was NEVER A SPIDER BITE. The brown recluse spider is not normally present where you live. ...Read more

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If a spider bite looks bruised what kind of spider is it?

Can't tell you from : This info alone. Spider bites can have variable appearances. It might cause a pink or red bump with no symptoms. Or it could itch or be painful. Venomous spiders may cause significant pain radiating far from the site, cramping, sweating, necrosis of tissue or worse if there is an allergic reaction. Seek medical care asap if you think a spider bit you ; you have fever, severe pain (can be felt at. ...Read more

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A spider bite with a bruise, dangerous?

It isn't that : Uncommon to have bruising around a spider bit. In ; of it's self it is not of great concern. Seek medical care asap if you think a spider bit you ; you have severe pain (can be felt at bite site ; possibly chest, back or abdomen); abdominal cramping /rigidness or ulceration of skin at site. You may need a tetanus shot (if you don't know when your last shot was or it has been > 10 years). ...Read more

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What kind of spider bite leaves a bruise?

From what I have: Read this is not limited to one species. Seek medical care asap if you think a spider bit you ; you have severe pain (can be felt at bite site ; possibly chest, back or abdomen); abdominal cramping /rigidness or ulceration of skin at site. You may need a tetanus shot (if you don't know when your last shot was or it has been > 10 years). Also medical care if you develop signs of secondary infection. ...Read more

Dr. Melissa Gowans
1,320 doctors shared insights

Ecchymoses (Definition)

Ecchymoses is also known as Bruise. Ecchymoses are bruises. Bruises are purple or red collections of blood under the skin that appear after blood vessels in the skin break, causing the blood to spread through the tissues ...Read more


Dr. Melissa Gowans
1,943 doctors shared insights

Bruising (Definition)

Bruises may occur over skin that is injured. Bruising from very minor injury can be a sign ...Read more