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I've been seeing and hearing reports from veterinarians around western KY & TN, of increased numbers of cases of dermatophilosis in cattle this year.
Most commonly, the lesions are most prevalent on dorsal areas, but some years, legs/lower extremities appear to be more severely affected.

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Did you call a vet? This is 3 possibilities I found .
I looked in my raising cattle book. It could be Photosensitization. It's a skin disease caused by eating plants that contain chemicals that intensify damaging action of sunshine. Pigmented skin is not infected, but pink skin can be, looking blistered. Damage may be so deep the affected skin dies and sloughs off. It affects just white markings such as face, legs, udders, etc. Plants that cause this are fescue, some clovers, wild carrot, lupine, perrenial rye grass, and dried buckwheat. Areas swell, itch, and blister, then develop thick crusts and oozing cracks. The animal quits eating. Sunshine causes pain. Treatment: put animal out of direct sun and give antibiotics.

Also could be cattle grubs in the imature stage of heel fly. Adult flys pester the cow and interfere with grazing. The immature larvae lives within the body much of the year. Emerging grubs come out through the skin on the back making holes. The flys torment cows by flying around thier legs to lay eggs on hair. You need systemic insecticide absorbed in the body to kill grubs.

Another possibility is scabies mites that deposit eggs on the skin. They attack any part of the body, picking skin to obtain food. As they multiply many wounds are made causing inflamation, intense itch, and small sores. The sores ooze and mix with dirt creating a scab that becomes infected and hardens to a gray or yellow color. Scabs increase in size. They feed on withers, head, tail, shoulders, etc. eventually infesting the whole body. Itching is so intense the animal is so busy scratching and rubbing it doesn't eat and may die if not controlled.

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