Urgent Referral for Excisional Biopsy Required
Any black pigmented lesion with itching on the head and chest must be urgently referred to a dermatologist or surgeon with expertise in pigmented lesions for complete excisional biopsy within 2 weeks to rule out melanoma. 1
Immediate Clinical Assessment
Examine the lesion(s) using the ABCDE criteria to determine malignancy risk 2:
- Asymmetry of the lesion
- Border irregularity
- Color heterogeneity (multiple shades of brown/black)
- Diameter >6-7 mm
- Evolution (recent changes in size, color, or shape) - this must coexist with at least one other criterion
The presence of itching (hypersensitivity) combined with 3 or more of these features strongly suggests melanoma 3. Additional concerning features include bleeding, crusting, oozing, or inflammation (reddish tinge within the lesion) 3.
Critical Action Steps
1. Full Skin Examination
Examine the entire skin surface including scalp and document all pigmented lesions, as patients may have multiple primaries 2. Check for lymphadenopathy in regional nodes and hepatomegaly 1.
2. Photographic Documentation
Take clinical photographs including regional anatomic landmarks before any intervention 4. This prevents wrong-site surgery and aids pathologic correlation.
3. Biopsy Technique - Critical for Accurate Diagnosis
Perform complete excisional biopsy with 2-5 mm clinical margins of normal skin and include subcutaneous fat 1, 2. This is the only acceptable diagnostic approach for suspected melanoma because:
- Partial biopsies risk misdiagnosis and make accurate staging impossible
- Breslow thickness (the most critical prognostic factor) cannot be determined from incomplete specimens
- The entire lesion must be examined to assess all histological parameters 2
Never use:
- Shave biopsies (inadequate depth)
- Punch biopsies (samples only part of lesion)
- Laser or electrocautery (destroys tissue architecture)
- Frozen sections 2
The excision should be elliptical with the long axis parallel to skin lines to facilitate re-excision if melanoma is confirmed 2.
4. Pathology Submission Requirements
Send the specimen with complete clinical information 2:
- Patient age and sex
- Exact anatomic site
- Clinical suspicion and ABCDE features present
- Whether itching or other symptoms present
Common Pitfalls to Avoid
Do not reassure and observe - itching in a pigmented lesion is a warning sign, particularly when combined with other ABCDE features 3. The 2-week referral window exists because early melanoma has 90% 5-year survival when <1mm thick, but outcomes deteriorate rapidly with delayed diagnosis 3.
Do not perform incisional biopsy in primary care - while occasionally acceptable for lentigo maligna on the face by specialists, there is no role for partial sampling in general practice 1.
Do not attempt treatment without histologic diagnosis - tissue destruction compromises final diagnosis and prognostic assessment 2.
Differential Considerations
While melanoma is the primary concern with black pigmented pruritic lesions on head/chest, the differential includes seborrheic keratosis, pigmented basal cell carcinoma, and pigmented actinic keratosis 2. However, the clinical approach remains identical - complete excisional biopsy is required for definitive diagnosis 1.
Dermoscopy may improve diagnostic accuracy in experienced hands but cannot replace histopathologic examination 2.
Post-Biopsy Management
If melanoma is confirmed, complete clinical examination of all regional lymph nodes is mandatory 2. Further staging investigations are determined by Breslow thickness from the pathology report.