It was a pleasure to speak with Dominique the founder of @HairPopp on Instagram live recently. She told me that this is a question that her online product shop sometimes gets from customers.
To see the full answer click on https://www.hairpopp.com/news/hair-loss-around-the-hairline/
There can be a range of reasons for hair loss, so I would recommend a medical Trichology consultation first, but if a quick cosmetic solution is needed then it is worth looking at hair fibres for a quick cosmetic solution. Different brands are available, but this clinic is an MS Hair Ambassador. Their camouflage kit offers great value as it has the camouflage fibres in your colour of choice, the fibres, spray and hairline optimiser. If you follow this link https://www.mshair.co.uk/pages/reviews?p=H1yE4hoYE and enter the code INGRID50 at the checkout, you are entitled to a 10% discount