• Alopecia
• Acniform eruptions
• Benign tumors
• Bullous diseases
• Dermoscopy
• Nevi, melanoma
• Nonmelanoma cancer
• Psoriasis and others
• Stds
• Vascular tumors
• Vulvar disease

• Melanocytic nevi
• Moles Melanocytic Nevi
• Moles Junctional Nevi
• Moles Compound Nevi
• Moles Intradermal Nevi
• Moles Speckled Lentiginous Nevus
• Mole Blue Nevus
• Mole Spitz Nevus
• Moles Halo Nevi
• Labial Melanotic Macule
• Becker's Nevus
• Mole Recurrent Previously Excised Nevi
• Moles Birthmark Congenital Nevi
• Atypical nevi
• Moles Atypical Nevi Information
• Moles Atypical nevi - Incidence
• Moles Atypical nevi - Appearance
• Moles Atypical nevi - Histology
• Moles Atypical nevi - Epidemiology
• Malignant Melanoma, Lentigo Maligna
• Skin Cancer Malignant Melanoma
• Skin Cancer Melanoma Appearance and Signs
• Skin Cancer Superficial Spreading Melanoma
• Skin Cancer Nodular Melanoma
• Skin Cancer Lentigo Maligna Melanoma
• Skin Cancer Acral-Lentiginous Melanoma
• Skin Cancer Melanoma Biopsy and Histology
• Skin Cancer Melanoma Biopsy Report
• Skin Cancer Melanoma Staging System and Prognosis
• Skin Cancer Melanoma Surgical and Medical Treatment
• Skin Cancer Melanoma Follow up examination
• Melanoma Mimics
• Melanoma Mimics Introduction
• Melanocytic Melanoma Mimics
• Non-Melanocytic Melanoma Mimics

Moles Halo Nevi

Halo nevi occur primarily during adolescence. The average age of onset is 15 years. The incidence in the population is estimated to be 1%. Most halo nevi are located on the trunk; they never occur on palms and soles. They may occur as an isolated phenomenon or several nevi may spontaneously develop halos. A pre-existing nevus develops a surrounding rim of hypopigmentation that heralds the gradual disappearance of the nevus over several months. The depigmented halo is symmetric and round or oval with a sharply demarcated border. Skin biopsy shows a junction or compound nevus surrounded by a dense infiltrate of lymphocytes. There are no melanocytes in the halo area. Halo nevi appear to be a host response directed against the nevus cells. Focal atypical nevus cells may be seen though the majority of the pre-existing nevi are benign. The halo usually re-pigments over a few years. Woods light accentuates the halo. Halo nevi also occur in people with vitiligo. A halo may rarely develop around malignant melanoma, but in such instances it is usually not symmetric. People with halo nevi should have a full skin examination to look for vitiligo and also to screen for melanoma. Removal of a halo nevus is unnecessary unless the nevus itself has atypical features. Parental concern over this impressive change is often reason for a conservative excision. In such cases, the mole part of a halo nevus may be removed by shave or excision.