"Hemorrhagic" is a commonly used adjective in the context and should be translated accordingly.

"The most common **hemorrhagic manifestations** are mild and include a positive tourniquet test, skin hemorrhages (petechiae, hematomas), epistaxis (nose bleed), gingival bleeding (gum bleed), and microscopic hematuria."
https://www.cdc.gov/dengue/resources/denguedhf-information-f...

Hemorrhagic manifestations and encephalopathy in cases of ...https://pubmed.ncbi.nlm.nih.gov › ...
by J Thakare · 1996 · Cited by 38 — These patients had clinical manifestations of fever, hemorrhagic manifestations, hepatomegaly, shock syndrome and encephalopathy. Sixty-six percent of patients ...

A Case of Dengue Fever With Hemorrhagic Manifestationshttps://www.ncbi.nlm.nih.gov › articles › PMC7358921
by MA Raza · 2020 — Additionally, we conducted an extensive review of the literature to elucidate pathophysiology, diagnosis, and management of hemorrhagic ...

Hemorrhagic manifestations. | Download Table - ResearchGatehttps://www.researchgate.net › figure › Hemorrhagic-man...
Download Table | Hemorrhagic manifestations. from publication: The 2003 outbreak of Dengue fever in Delhi, India | Dengue fever (DF) and Dengue hemorrhagic ...

Bleeding Manifestations in Patients with Denuge - CDChttps://www.cdc.gov › training › cme › ccm
PDF
Mild hemorrhagic manifestations such as petechiae, purpura, epistaxis, and gingival bleeding are relatively common even in nonsevere dengue cases; they occur in ...

Hemorrhagic Manifestations of Reversible Cerebral ...https://www.ahajournals.org › STROKEAHA.109.572313
Sep 30, 2010 — Hemorrhagic Manifestations of Reversible Cerebral Vasoconstriction Syndrome. Frequency, Features, and Risk Factors. Anne Ducros; , MD, PhD ...

Brasil - Comments on the clinical and laboratory ... - SciELOhttps://www.scielo.br › rbhh
by RPG Lemes · 2014 · Cited by 4 — Hemorrhagic manifestations, such as epistaxis, gingival bleeding, menorrhagia, gastrointestinal bleeding, intracranial bleeding, hematuria, effusions and ...

Clinical and laboratory characteristics of patients with dengue ...https://www.scielo.br › rbhh
by DE Fujimoto · 2014 · Cited by 41 — The lack of scientific basis for the proper management of cases with hemorrhagic manifestations, especially regarding transfusion procedures, ...

Clinical manifestations of dengue hemorrhagic fever in Puerto ...https://www.scielosp.org › article › rpsp
by JG Rigau-Pérez · 1997 · Cited by 65 — Hemorrhagic manifestations were mild; hemoconcentration, hypoalbuminemia, and elevated aspartate and alanine aminotransferase (AST and ALT) levels were ...

panmyelophthisis with hemorrhagic manifestations in rats on a ...https://rupress.org › jem › article › PANMYELOPHTHISI...
by P György · 1937 · Cited by 43 — PANMYELOPHTHISIS WITH HEMORRHAGIC MANIFESTATIONS IN RATS ON A NUTRITIONAL BASIS ... J Exp Med (1937) 66 (5): 579–602.

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Note added at 6 hrs (2021-08-19 10:03:00 GMT)
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Sometimes a literal translation suffices, and this would appear to be one of those instances, as the thousands of related G-hits suggest.

"hemorrhagic manifestations"
About 83,800 results (0.48 seconds)
https://www.google.com/search?q="hemorrahgic manifestations"...

¡Espero que le sirva!

Saludos desde Vietnam :-)

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Note added at 20 hrs (2021-08-20 00:27:48 GMT)
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U.S. DEPARTMENT OF HEALTH & HUMAN SERVICES. CENTERS FOR DISEASE CONTROL & PREVENTION

Dengue Hemorrhagic Fever and Dengue Shock Syndrome

Some patients with dengue fever go on to develop
dengue *hemorrhagic* fever (DHF), a severe and
sometimes fatal form of the disease. Around the time
the fever begins to subside (usually 3–7 days after
symptom onset), the patient may develop warning
signs of severe disease. Warning signs include severe
abdominal pain, persistent vomiting, marked change
in temperature (from fever to hypothermia),
**hemorrhagic manifestations**, or change in mental
status (irritability, confusion, or obtundation). The
patient also may have early signs of shock, including
restlessness, cold clammy skin, rapid weak pulse, and
narrowing of the pulse pressure (systolic blood
pressure − diastolic blood pressure). Patients with
dengue fever should be told to return to the hospital
if they develop any of these signs.
https://www.cdc.gov/dengue/resources/denguedhf-information-f...

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Note added at 21 hrs (2021-08-20 01:14:29 GMT)
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Also spelled/spelt: 'haemmorrhagic' -- more common perhaps in the UK (as seen in Liz's reference) and, by extension, in (parts of) the former British empire, as seen in the first reference below --- a study from (or published in) India.

Haemorrhagic manifestations of dengue fever and ... - PubMedhttps://pubmed.ncbi.nlm.nih.gov › ...
by DK Chhina · 2009 · Cited by 23 — Haemorrhagic manifestations of dengue fever & their management in a tertiary care hospital in north India. Indian J Med Res. 2009 Jun;129(6):718-
https://pubmed.ncbi.nlm.nih.gov/19692757/

Haemorrhagic manifestations of influenza A infection in children.
Abstract : This is a report of an outbreak of influenza in Burma which was unusual for its **haemorrhagic manifestations** among young children. Between June and November 1971, a total of 380 children were admitted to hospital with a suspicion of dengue **haemorrhagic fever**, but in only a small number was there serological evidence of an arbovirus infection.
https://www.cabdirect.org/cabdirect/abstract/19752902919

"haemorrhagic manifestations"
About 24,800 results (0.41 seconds)
https://www.google.com/search?q="haemorrhagic manifestations...

manifestaciones hemorragíparas = hemorrhagic/haemorrhagic manifestations (or 'events,' as Giovanni suggests)

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Note added at 1 day 7 hrs (2021-08-20 11:10:07 GMT)
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Aunque cesan las manifestaciones hemorragíparas ... = Even if the hemorrhagic/haemorrhagic manifestations cease ...

Or even "bleeding events" could be a good choice here.

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Note added at 1 day 11 hrs (2021-08-20 15:50:19 GMT)
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"bleeding episodes" is also another commonly used alternative that you may want to consider here.