Hair loss- alopecia basics Telogen effluvium. A common presentation in primary care this chart on alopecia on A4Medicine presents the clinician with a structured approach to hair loss. Images are not presented here, once the GP is able to narrow down www.dermnetz.org is one of the finest resources for dermatology on the internet. Understanding of the various growth phases is clearly shown and examination is covered. The pull test is described and baseline laboratory investigations have been shown.The common causes as Telogen effluvium, androgenic alopecia, alopecia areata, anagen effluvium are discussed briefly. Causes of scarring alopecia are mentioned but not discussed as scarring alopecia would be managed in secondary care.