Annular Lupus Panniculitis on the Scalp: A Rare Case in a Toddler and Key Insights Into Childhood Skin Health
When a 1-year-old boy’s parents noticed his scalp hair falling out in a smooth, ring-shaped patch—no redness, no scaling, just a growing bald spot—they turned to dermatologists at the First Hospital of China Medical University (Shenyang, China) for answers. What they learned shed light on a rare form of lupus that targets the scalp, offering hope for families facing similar mysteries.
The Case: A Toddler’s Unexplained Hair Loss
The boy’s symptoms were simple but concerning: over one month, he developed a 1.5 cm-wide annular (ring-like) bald patch on the right side of his head. The skin was smooth, no rash or irritation—just missing hair. He felt no pain, and his medical history (including family health) was unremarkable.
To solve the puzzle, the team ran tests: blood counts, urine analysis, liver/kidney function checks, and autoimmune markers (like anti-double-stranded DNA). Most results were normal, but two clues emerged: low levels of C3 (an immune system protein) and a weakly positive antinuclear antibody (ANA) test (1:80). The real diagnosis came from a skin biopsy: under the microscope, the deep skin layers and hair follicles showed inflammation (lymphocytes and plasma cells), extra mucin (a gel-like substance) in fat cells, and hyaline fat degeneration. An Alcian blue stain confirmed the mucin, and immunofluorescence tests ruled out key immune deposits.
The verdict? Annular lupus panniculitis—a rare subtype of chronic cutaneous lupus erythematosus that affects the scalp.
What Is Annular Lupus Panniculitis?
Lupus panniculitis (or lupus erythematosus profundus) is a skin-focused form of lupus that inflames the deep subcutaneous fat. Most cases appear on the face, trunk, or limbs, but the scalp variant is especially uncommon. It primarily strikes young kids and teens—often East Asian or Caucasian—and its defining features are:
- Non-scarring alopecia: Hair loss that doesn’t leave permanent marks (unlike some autoimmune conditions).
- Linear/annular patterns: Lesions follow Blaschko’s lines (invisible skin patterns from embryonic development), so they look ring-shaped, arc-like, or linear.
- Mild or no inflammation: Unlike other lupus types, the scalp patches are often smooth with little to no redness.
Crucially, most patients don’t develop systemic lupus (which affects organs like kidneys or joints). While about half have a positive ANA test, few meet the criteria for full-body disease.
Treatment Works: Hair Regrowth in 3 Months
The boy received a daily dose of 8 mg methylprednisolone (a low-dose corticosteroid to reduce inflammation). The results were dramatic:
- 1 month later: Hair started growing back.
- 3 months later: The bald patch was gone—no scars, no recurrence.
This aligns with research: linear/annular lupus panniculitis is often reversible with treatment. Common options include corticosteroids, hydroxychloroquine (an antimalarial used for lupus), or dapsone (an anti-inflammatory). Early diagnosis is key—catching it before inflammation damages hair follicles permanently.
What This Means for Families
If your child has unexplained hair loss—especially in a linear or ring-shaped pattern—don’t wait to see a dermatologist. Annular lupus panniculitis is rare, but it’s important to rule out other conditions like:
- Trichotillomania: Hair-pulling (often stress-related).
- Tinea capitis: Fungal scalp infection (causes scaling).
- Alopecia areata: Patchy hair loss from immune attack on follicles.
- Linear morphea: Hardened, discolored skin patches.
The takeaway? This case proves that even rare childhood skin conditions can have positive outcomes. With prompt care, most kids regain their hair and avoid long-term issues.
The Original Research
This study was published in the Chinese Medical Journal (2021) by Drs. Hao Guo, Hong-Wei Yan, Xing-Hua Gao, and Jiu-Hong Li of the First Hospital of China Medical University. It was funded by the National Natural Science Foundation of China (Grant No. 81903228).
Learn More
For deeper context, read the studies cited by the authors:
- Udompanich S et al. (2019). Linear and annular lupus panniculitis of the scalp. Case Rep Dermatol.
- Tsuzaka S et al. (2012). Lupus erythematosus profundus with arc-shaped scalp plaques. Lupus.
- Arai S et al. (2009). Clinical entity of lupus erythematosus panniculitis. Autoimmun Rev.
The full case study’s DOI is doi.org/10.1097/CM9.0000000000000959.
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