皮肤的小块色素性病损可能是属于能治疗阶段的恶性黑色素瘤,因此医生往往不愿意把这种肿瘤视为良性而漏掉。不过,在实际工作中,为避免将所有色素性病损都切除,就需要有可靠的临床诊断标准。原发性黑色素瘤的色素特征,特别是彩斑的颜色常能与良性肿瘤鉴别。但是有一种常见的良性皮肤纤维瘤可能酷似结节性黑色素瘤。典型的皮肤纤维瘤是直径不到1厘米的硬结节,有均匀而适度的或暗的色素沉着。好发于中年人的肢体,妇女多见。用拇指和食指横向挤压,皮损即起绉纹或凹陷, Small patches of pigmented lesions of the skin may be malignant melanomas that can be treated at the stage of treatment, so doctors are often reluctant to treat such tumors as benign and missed. However, in practice, in order to avoid the removal of all pigmentary lesions, there is a need for reliable clinical diagnostic criteria. The pigment characteristics of primary melanoma, especially the color of color spots, can often be distinguished from benign tumors. However, there is a common benign dermal fibroid that may resemble nodular melanoma. Typical dermal fibromas are hard nodules less than 1 cm in diameter with uniform and moderate or dark pigmentation. Prone to occur in the limbs of middle-aged people, more common in women. With lateral compression of thumb and forefinger, skin lesions become ridges or depressions.