Anyone have any idea what this is? It has appeared on both of my colleague's shins. A little sore to touch, but not itchy. Appeared once before but a long time ago. Now it's appeared again.

Thanks

Peter

Anyone have any idea what this is? It has appeared on both of my colleague's shins. A little sore to touch, but nor itchy. Appeared once before but a long time ago. Now it's appeared again.

Thanks

Peter