His feet werent used to the rigorous training hed undertaken for his firsthalf marathon.

“The longest thing I had done prior to that was a 5K.

I had no idea what to expect, Mark tells SELF.

Gym locker room with showers

Alacatr / Getty Images

That visit to the doctors office spiraled into a painful, exasperating saga thats ongoing to this day.

It goes far beyond soggy balls of hair, as foul as they are.

You could also wind up with nail fungus, which typically manifests with dry, thickened, discolored nails.

Mark’s feet

Mark’s feet, with the left swollen due to cantharidin treatment. Courtesy of The Rod Ryan Show, 94.5 The Buzz

Plantar warts, on the other hand, are caused byhuman papillomavirus(HPV).

But even with treatment, Marks one wart multiplied into five.

It was horrible, Mark says.

Five warts the doctors removed from Mark’s foot.

The warts the doctors surgically removed from Mark’s foot. Courtesy of The Rod Ryan Show, 94.5 The Buzz

Instead, earlier this year, the doctors decided to do surgery.

Doctors initially thought the surgery would be really quick.

Mark’s doctors weren’t sure why his plantar warts refused to respond to treatment.

Graphic image of Mark’s foot after surgery.

Mark’s foot after surgery. Courtesy of The Rod Ryan Show, 94.5 The Buzz

The only thing that ever came up was the doctor asking if I had anautoimmune disease, Mark says.

That was the only explanation they could think of for why my body didn’t respond.

(He got the fish for free from Kerecis, the company behind this technology.)

Cod skin for Mark’s skin graft

The piece of cod skin Mark’s doctors used for his skin graft. Courtesy of The Rod Ryan Show, 94.5 The Buzz

Kerecis Omega3 is intact fish skin that is rich in naturally occurring omega-3 polyunsaturated fatty acids.

This past Friday, Mark ran for the first time in a very long time.

“Simple hygiene can work wonders to fight off the chances of infection,” he says.

Mark’s foot healing after surgery.

Mark’s foot healing after surgery. Courtesy of The Rod Ryan Show, 94.5 The Buzz

“It only takes one encounter to contract an infection,” Yeldell says.

Its a lesson that, unfortunately, Mark learned the hard way.

Ive become much more cautious, he says.

I started going back to the gym over lunch, so I still have to shower there.

But I always, always, always check that that I have shower shoes.

Below are some photos that portray Mark’s painful experience.

The images are extremely graphic.

Name has been changed.

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