Localized purple or dark spots on the skin that do not fade with pressure suggest:

Question

BlackTom AI · Accepted Answer

Purple or dark, fixed macules that do not blanch with pressure are characteristic of blood stasis (stagnation) because the color is due to blood outside intact capillaries rather than simple vasodilation.

1) Relevant knowledge points and concepts
- Blanching test: pressing skin forces blood out of capillary beds; erythema from vasodilation (inflammation) will fade (blanch), while extravasated blood (petechiae, purpura, ecchymoses) will not.
- Traditional Chinese Medicine (TCM) signs: blood stasis presents as localized, fixed, dark-purple or bluish spots, often with pain that is stabbing or fixed in location, and a choppy/thready pulse.
- Differential patterns: damp-heat, qi deficiency, and external wind produce distinct skin manifestations (reddish, generalized, migratory, or pale/bruising patterns).

2) Step-by-step reasoning
- Observe: spots are purple/dark and localized.
- Perform blanching test: pressure is applied and the spots do not fade.
- Interpretation: non-blanching indicates blood is outside the vessels (stagnant or extravasated), not simply vascular dilation.
- Match to TCM pattern: localized, dark, fixed discoloration corresponds to blood stasis.

3) Calculations
- None required for this diagnostic reasoning question.

4) Why the correct answer is correct
- Blood stasis produces fixed, dark-purple discoloration because stagnant blood in the microcirculation or leaked blood pigments remain in tissues and cannot be displaced by pressure; hence the non-blanching quality is diagnostic of stasis.

5) Why the other options are incorrect
- B. Damp-heat: typically causes red, swollen, oozing, or greasy lesions with a feeling of heat and may blanch or appear inflamed rather than fixed dark spots.
- C. Qi deficiency: leads to pallor, fatigue, spontaneous sweating, and easy bruising (diffuse), but not usually localized, dark, non-blanching macules.
- D. External wind: causes migratory, itchy, fleeting rashes or sudden onset of symptoms, not fixed dark non-blanching discoloration.

6) Conclusion
The described sign (localized purple/dark spots that do not fade with pressure) is consistent with blood stasis. This confirms the correct answer: A. Blood stasis.

Localized purple or dark spots on the skin that do not fade with pressure suggest:Single choice

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