3 doctors weighed in:

Just found bumps on the back of his elbow which are really itchy?

3 doctors weighed in
Dr. Nika Ferdowsi
Family Medicine
2 doctors agree

In brief: Rash

Any skin condition is difficult to identify without seeing it or having more history.
What does it look like?Is it red?Flad/raised? Etc. It could be that your knees have come into contact with something and is showing an allergic reaction. Could be eczema or psoriasis or skin rashes can sometimes be a sign of something going on internally. Best to have a doctor take a look and take a full history.

In brief: Rash

Any skin condition is difficult to identify without seeing it or having more history.
What does it look like?Is it red?Flad/raised? Etc. It could be that your knees have come into contact with something and is showing an allergic reaction. Could be eczema or psoriasis or skin rashes can sometimes be a sign of something going on internally. Best to have a doctor take a look and take a full history.
Dr. Nika Ferdowsi
Dr. Nika Ferdowsi
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