You will be shown a question, followed by excerpts from biomedical research papers. Please answer the question based on the provided context. Do not include any text in your response other than the answer.

Question: Describe Achenbach’s syndrome.

Context: BACKGROUND: Paroxysmal finger haematoma (also known as "Achenbach syndrome") is a benign condition resulting in the sudden appearance of bruising on one or more fingers, either spontaneously or after minimal trauma, and resolving without treatment.
DISCUSSION: In the absence of known aetiologies and/or treatments for spontaneous paroxysmal finger haematomas, a knowledge of this rare condition can at least help doctors reassure their patients by diagnosing their condition and pointing out the benign nature thereof.
It presents with unilateral volar discoloration of a finger (100 %). It is associated with pain (n = 7/12, 58. %), edema (n = 7/12, 58 %), and paresthesia (n = 3/12, 25 %). The median time to resolution of symptoms without any intervention was 4 days (range 2-14).CONCLUSION: AS is self-limiting and a non-urgent surgical condition. It can be differentiated from other pathologies by clinical spectrum, patient demographics and in doubtful circumstances (acute limb ischemia) by Doppler sonography.
[Paroxysmal finger hematoma (Achenbach syndrome)].
Paroxysmal haematoma of the fingers (Achenbach's syndrome) is a rarely reported entity. It often occurs spontaneously or subsequent to minor injuries.
[Paroxysmal finger hematoma (Achenbach syndrome)].
Paroxysmal finger haematomas (Achenbach's syndrome) with angiographic abnormalities.
Achenbach’s syndrome is Paroxysmal finger haematoma. It is benign condition resulting in the sudden appearance of bruising on one or more fingers, either spontaneously or after minimal trauma, and resolving without treatment.It can be differentiated from other pathologies by clinical spectrum, patient demographics and in doubtful circumstances (acute limb ischemia) by Doppler sonography.