Needle dangers far ranging

Here is a medical term for a condition you have not likely heard: "Anisocoria". It can happen if you use a needle. What is it?
- Anisocoria: Enlargement of one pupil; Pupils of different size.

It can come from infected blood making an abcess in the brain, from an infection. Using a needle every day can do that.

Here is the rest of the definition, FYI:
"Abscesses can form in almost every part of the body and may be caused by infectious organisms, parasites, and foreign materials.

Brain abscesses commonly occur when bacteria or fungi infect part of the brain. Inflammation develops in response. Infected brain cells, white blood cells, and live and dead microorganisms collect in a limited area of the brain.
This area becomes enclosed by a membrane that forms around it and creates a mass. Infectious agents gain access to the brain in several ways.
The most common way is through infected blood." [as in, what you get with needle use].
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