This condition is called Telogen Effluvium. It's a reversible condition in which hair falls out after a stressful experience.
The stress pushes large numbers of hair follicles into a resting phase. Within a few months, those hairs can fall out. Types of stress can include any hormonal issues like
thyroid or any major illness like Covid. It's a reversible condition but needs to b treated to prevent further hair loss. Another possiblity could b Seborrheic dermatitis. It is a skin condition that causes an itchy, flaky rash to develop on the scalp, face, or other parts of the body. Many people call it dandruff. U can experience temporary hair loss with seborrheic dermatitis. Consult a Dermatologist