HIV-associated facial lipoatrophy
HIV-associated lipoatrophy, which includes fat loss of the limbs, buttocks, and face, has been closely linked to the use of the thymidine nucleoside reverse-transcriptase inhibitors stavudine and zidovudine. The lipoatrophy can have severe psychological effects and is also associated with increased risk of metabolic disorders and cardiovascular disease. Cessation of the causative drugs usually does not result in noticeable improvement of the lipoatrophy.
A syndrome of peripheral lipoatrophy affecting HIV-infected patients was first described in 1998, coinciding with the introduction of highly active antiretroviral treatment (HAART) . Fat is lost from the limbs, buttocks, and face .
Although initially ascribed to protease inhibitor treatment, further clinical studies indicated that the use of thymidine nucleoside reverse-transcriptase inhibitors (NRTIs), particularly stavudine and zidovudine, is a dominant risk factor.   Evidence suggests that the fat wasting is due to NRTI-induced mitochondrial toxicity. 
There is strong associations between stavudine treatment and risk of lipoatrophy. Zidovudine treatment is associated with lipoatrohy to a lesser extent. 
Fat is lost from the nasolabial region, the temples and the eye sockets. Of note, lipoatrophy is independently associated with metabolic disorders, including dyslipidemia, insulin resistance, and increased risk of cardiovascular disease.   
The mitochondrial toxicity associated with stavudine and zidovudine is thought to be related to the medications' inhibitory effect on mitochondrial DNA polymerases.  Adipose samples from NRTI-treated patients have less mitochondrial DNA and greater tissue macrophage infiltration as compared to NRTI-naive HIV-positive patients. 
More severe lipoatrophy is correlatd with cumulative drug exposure . Although there has been a significant reduction in lipoatrophy incidence with the decreasing use of stavudine and zidovudine over the last decade, the persistent nature of established lipoatrophy, with only minimal improvement after switching or removing NRTI drugs , has ensured that the syndrome remains prevalent.
This is a clinical diagnosis.
Exposure to stavudine and/or zidovudine. The protease-inhibitors have been implicated to a lesser extent.
Patients have symmetrical facial fat atrophy.
If loss of orbital fat has caused enophthalmos, patients may complain of dry eye symptoms. Facial lipoatrophy can be stigmatizing and has been associated with depression. In one survey of HIV-infected patients, lipoatrophy was associated with higher levels of depression than lipohypertrophy and facial lipoatrophy was associated with the most severe depression scores. 
Because lipoatrophy is independently associated with metabolic disorders, including dyslipidemia, insulin resistance, and increased risk of cardiovascular disease, the patient should be screened for dyslipidemia and diabetes.
Poly-L-lactic acid and calcium hydroxylapatite are injectable fillers that have been FDA approved for the treatment of facial fat loss in patients with HIV. Additionally, adipose derived progenitor cells, liquid silicone and hyaluronic based fillers have been used to improve cosmesis in this condition. 
Bilateral orbital floor implants can treat enophthalmos.
HIV-associated lipoatrophy has been shown to persist after 5 years of follow up, with little recovery regardless of whether the implicated drugs were discontinued . The use of injectable facial fillers can help patients normalize their appearance.
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