How can I tell if my lipodystrophy is HIV-related or congenital?

The short version: HIV-related lipodystrophy starts after you begin antiretroviral therapy; congenital lipodystrophy is present from birth or early childhood.

The single most useful clue is timing. HIV-associated lipodystrophy appears months to years after starting antiretroviral drugs, especially the older thymidine analogues like stavudine and zidovudine [5]. Congenital lipodystrophy (Berardinelli-Seip type) is visible at birth or in the first years of life: the baby looks muscular because there is almost no body fat, has a prominent abdomen from fatty liver, and often shows acanthosis nigricans (dark, velvety skin) and developmental delays [12].

The pattern of fat loss also differs. HIV lipodystrophy typically causes loss in the face, arms, legs, and buttocks while fat accumulates in the neck (buffalo hump), abdomen, and around internal organs [3, 4]. Congenital generalized lipodystrophy is total: the child has virtually no subcutaneous fat anywhere, giving a distinctive appearance with hollow cheeks, prominent veins, and a muscular look that is actually the absence of fat [12].

Metabolic problems are severe in both, but congenital forms tend to be more extreme. In one case report, a 5-year-old with congenital lipodystrophy had triglycerides of 6.9 mmol/L and insulin resistance severe enough to cause acanthosis nigricans [12]. HIV lipodystrophy also brings insulin resistance and high triglycerides, but the severity depends on which drugs were used and for how long [3].

A negative HIV test rules out the HIV form. Genetic testing can confirm congenital types: mutations in AGPAT2 (type 1) or BSCL2 (type 2) are the most common [11]. The 2025 clinical guidance notes that fat-shadow DXA scanning has 100% sensitivity and specificity for generalized lipodystrophy, and 85% sensitivity for partial forms [11]. That test is not widely available, but it exists.

My call: if you have a negative HIV test and the fat loss began in childhood, it is almost certainly congenital. If you are HIV-positive and the changes started after starting antiretrovirals, it is drug-induced. A genetic test or fat-shadow DXA can settle the rare ambiguous case. Confidence: high — the distinguishing features are well-documented and the diagnostic tools are specific.