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Data source: VAERS (Vaccine Adverse Event Reporting System)

Data through 2026 · Updated quarterly

Built by TheDataProject.ai · © 2026 VaccineWatch

Important: VAERS accepts reports of adverse events following vaccination. For any given report, there is no certainty that the reported event was caused by the vaccine. Reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable. Most reports to VAERS are voluntary, which means they are subject to biases. This data cannot be used to determine if vaccines cause or contribute to adverse events.

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Important: VAERS reports alone cannot determine if a vaccine caused an adverse event. Reports may contain incomplete, inaccurate, or unverified information. Correlation does not equal causation.

  1. Home
  2. Vaccines
  3. HPV (Gardasil)
  4. Injection site mass
HPV (Gardasil)×Injection site mass

Injection site mass Reports for HPV (Gardasil)

#119 most reported symptom for this vaccine

260
Reports
0
Deaths
1
Hospitalizations
0
Mortality Rate
%
0.4
Hosp. Rate
%

Injection site mass and HPV (Gardasil)

Injection site mass has been reported 260 times in association with HPV (Gardasil) vaccination in VAERS. This represents 0.6% of all 44,434 reports for this vaccine.

Among these reports, 0 mentioned death (0.00%) and 1 involved hospitalization (0.4%).

Injection site mass is the #119 most frequently reported symptom for HPV (Gardasil) out of 2579 total symptoms.

Disclaimer: VAERS reports describe events that occurred after vaccination but do not establish that the vaccine caused the event. Many reported symptoms may be coincidental or related to underlying conditions.

What This Means

Seeing 260 reports of Injection site mass after HPV (Gardasil) vaccination may seem alarming, but context is critical.

The mortality rate among these reports is very low at 0.00%, suggesting most cases are non-fatal.

Important Context

•Association, not causation: These reports show Injection site mass occurred after vaccination, not that the vaccine caused it.
•Background rates: Injection site mass may occur naturally at baseline rates in the population, unrelated to vaccination.
•Anyone can report: VAERS accepts reports from anyone — patients, parents, healthcare providers — without requiring medical verification.
•Denominator missing: VAERS counts reports, not rates per dose. Without knowing how many doses were given, raw counts can be misleading. Learn more →

Similarly Ranked Symptoms

Musculoskeletal pain270 reportsBlood pressure decreased264 reportsSeizure260 reportsInjection site reaction257 reports

Quick Facts

Reports:260
Deaths:0
Hospitalizations:1
% of Vaccine:0.6%
Rank:#119 of 2579

Related Pages

HPV (Gardasil) OverviewInjection site mass (All Vaccines)Why Raw Numbers MisleadTop Symptoms Analysis

Data Source

This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.