Dad is in nursing home for few months, he gets bed sores.what must be the reason?

Pressure.: Bed sores are pressure sores (medical term decubitus ulcer or decubiti--plural) caused by too much time immobilized without movement, coupled with too-little tissue padding over bony prominences. This is why pressure sores are on the buttocks (for wheelchair-bound patients like paraplegics) or heels for bed-bound individuals. Special pads and bedding can help. Nurses must roll and move patients!

Sustained pressure: Pressure sores are primarily due to sustained unrelieved pressure in one area. This can be further aggravated by poor nutrition, fecal soilage, skin disorders, immobility, nerve impairment, etc. Treatment requires a full evaluation of all contributing factors.

Pressure ulcer: Your father should be seen by a specialist in wounds, either home health nursing or in a wound center if the travel is not too onerous. There are several changes that you will need to make in the home related to equipment (mattresses and cushions) and activity and turning schedules. You will also need to have a nutritional consult also related to protein intake.