
What Causes Cluster Of Small Flat And Raised Bumps On Skin?

Appears to be a Cherry Angioma
Detailed Answer:
Looking at the picture, it appears to be a cherry angioma. It's hard for me to tell by the picture if it is raised or relatively flat. Cherry angiomas are raised and are usually a very deep red. I am not surprised that it bled as basically poking it is the same as poking into a blood vessel.
If you are very concerned, you can go back to the dermatologist and be sure she saw it. People who are prone to getting these (usually in middle age) often get a number of them. If you are getting angiomas on your chest, it is likely the same thing.
Cherry angiomas do not cause problems unless they are repeatedly traumatized (such as on the scalp) which can result in bleeding. They can be treated with cautery or laser.


Some more info:
Detailed Answer:
You probably already know these things but here are signs to watch for regarding melanoma:
A - Asymmetry: meaning if you drew a line threw the center, it would not look the same on both sides.
B - uneven irregular Border around it's edges.
C - Color: most moles are one color. Melanoma can be more than one color or various shades of one color all in one mole.
D - Diameter: melanomas are usually 6mm or larger (larger than the diameter of an eraser tip).
E - Evolving: ANY change is concerning, whether changing color, shape, or size or new bleeding or crusting.
It is possible for a skin cancer to bleed if poked like happened to your's but I am basing my assessment of it being benign because of these other characteristics. It just has all of the characteristics of a benign cherry angioma.
It is reasonable to watch the area over time and go back to the dermatologist if you note any changes.
Going back to the dermatologist for a quick check regardless might make you feel better, and it is not wrong or abnormal to do.
I am sending you a link to a page of pictures of cherry angiomas as I think, based on the photo you sent, that your's looks like the one on the bottom of page 1, which is a very characteristic appearance:
http://www.dermnet.com/images/Cherry-Angioma/photos/1
Best wishes and I hope this info helps.

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