Scarlet Fever Rash
The photo shows the typical Scarlet Fever rash on the forearm.
The scarlet fever rash first appears as tiny red bumps on the chest and abdomen that may spread all over the body. Looking like a sunburn, it feels like a rough piece of sandpaper, and lasts about 2-5 days.
Scarlet fever is a disease caused by the same bacteria (Streptococcus) that causes strep throat. A person with Scarlet fever has a throat that is red and sore, usually a fever, usually swollen glands in the neck, and a Scarlet fever rash.
Source: CDC PHIL
From the CDC's Public Health Image Library (http://phil.cdc.gov), ID#5163, in the public domain.