Actinic keratosis, also referred to as solar keratosis, is a pre-cancerous skin lesion caused by long term sun exposure and there are several possible treatments.

Terry Baker has had skin cancer four times and now he's being treated for a potentially pre-cancerous lesion on his face.

He is also trying to be an example to kids and parents of why skin protection when you're young is so important.

"I think the reason we're here today is so that parents can see that wow, there is a reason that you have to use sun screen so that when you get to be my age, your children won't have to go through what I'm undergoing," said Baker.

Cathy O'Brien is a nurse practitioner specializing in dermatology.

Her treatment of choice for Terry is Efudex, which is a topical treatment which causes the skin to peel and eliminate the lesions.

"Some of those develop into your squamous cell carcinomas...We try to stay on top of them and treat them as they become thick," said O'Brien.

Using Efudex twice daily will cause the skin to redden and the damaged area to dry and exfoliate.

"Week four will be the best week of redness, erosion and crusting," said O'Brien.

There are actually several possible treatments for solar keratosis:

• freezing with liquid nitrogen
• photodynamic therapy which uses a a topical chemical and a blue light
• a chemical peel such as Efudex
• laser skin resurfacing

Baker will be visiting a Wiley School classroom to show the kids the problem that ultra violet rays can cause.

We'll be following the case as well and will show you in a few weeks the effect Efudex has had on his skin.