Welcome at HCM.
It looks from your details that your husband is suffering from swelling in his leg.
In his case this swelling can be due to following reason-
-Due to muscle strain
-Due to DEEP VEIN THROMBOSIS(which should be attend earliestly by investigations like DOPPLAR).
-Due to any general disorder like thyroid
problem,high blood pressure
He should get investigated from a doctor earliestly.