It seems that your father is having actinic prurigo
There are itchy papulonoduar lesions on sun exposed area.
The disease may be due to over exposure to sun.
He must avoid sun exposure.
He should cover the affected area.
Give him anti histaminics like levocetirizine
till itch subsides.
If there is infection,give him antibiotics.
If the condition is embarrasing, give him steroids
in tappering dose.
Apply steroid cream on the lesions.
Fatigue may be due to senile age,vitamin deficiency
or some internal disease.
Complete blood check up may be done to rule out DM,thyroid
,liver diseases,renal diseases,blood diseases or other.
Antioxidants,calcium and vitamins may be given to improve general health.
Keep him reassured to improve psychologic status.
I hope you got my answer.
Dr. Ilyas Patel MD